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h5. Beach Sand, Green Sand |
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Green Sand Beach, South Point |
| Olivine sand |
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Location:
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Green Sand Beach, South Shore, Big Island, Hawaii, USA
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Depositional facies:
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Medium to high energetic beach in a narrow bay limited by rocks
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Provenance:
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Mixture of in situ olivine basalts and few shells
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Composition:
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Olivine, some pyroxene, opaque grains; aragonitic shell fragments
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Petrographic thin section:
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| In the bright field the dominant | |
Bright field |
| Dark field |
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Texture:
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medium to coarse grained, well sorted, subrounded
Sample number | Collector | Date of sampling |
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heubeck0032 | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin | 1992 |
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Comments:
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Known beach to sand collectors...
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Beach
| !NA_South_Point_HI.jpg|thumbnail! | | !South-Point-HI_mak.JPG|thumbnail! |
| Green Sand Beach, South Point \\
{table-cell:width=30%}
{table-cell} | Olivine sand |
| *Location* \\ | Green Sand Beach, South Shore, Big Island, Hawaii, USA |
| *Depositional facies* \\ | Medium to high energetic beach in a narrow bay limited by rocks |
| *Provenance* \\ | Mixture of in situ olivine basalts and few shells |
| *Composition* \\ | Olivine, some pyroxene, opaque grains; aragonitic shell fragments |
| *Texture* | Medium to coarse grained, well sorted, subrounded |
h6. Petrographic thin section:
| *Description* | In the bright field the dominant olivine is almost colourless and shows a high and scarred relief. In the dark field the intense 1st order coloures are visible |
| !South_Point_ts_IIsm.jpg|thumbnail! | | !South_Point_ts_x.JPG|thumbnail! |
| Bright field \\
{table-cell:width=30%}
{table-cell} | Dark field |
| *Sample number* | heubeck0032 |
| *Collector* | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
| *Date of sampling* | 1992 |
h6. Comments:
Known beach to sand collectors...
Bekannter Strand unter Sandfreunden. Die stellenweise blasige, glasige oder feinkörnig basaltische Matrix wird durch den Wellenschlag der Brandung rasch zerkleinert und verwittert durch das subtropische Klima; grobkörniger Olivin reichert sich kurzzeitig in der Swashzone des Strandes an. Wegen der Sensitivität von Olivin gegenüber chemischer Verwitterung ist dies ein kompositionell höchst ungewöhnlicher Sand. Olivin kommt so gut wie nie in Sandsteinen vor, weil der Olivin während der Diagenese zersetzt wird.
[Additional data page|geowisssand:0032 Additional data]
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